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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 105 |
| 3 | 165 |
| 4 | 205 |
| 5 | 231 |
| 6 | 273 |
| 7 | 301 |
| 8 | 341 |
| 9 | 385 |
| 10 | 465 |
| 11 | 561 |
| 12 | 609 |
| 13 | 645 |
| 14 | 651 |
| 15 | 861 |
| 16 | 889 |
| 17 | 903 |
| 18 | 1045 |
| 19 | 1065 |
| 20 | 1105 |
| 21 | 1265 |
| 22 | 1281 |
| 23 | 1365 |
| 24 | 1387 |
| 25 | 1491 |
| 26 | 1705 |
| 27 | 1729 |
| 28 | 1771 |
| 29 | 1785 |
| 30 | 1905 |
| 31 | 2041 |
| 32 | 2047 |
| 33 | 2145 |
| 34 | 2211 |
| 35 | 2265 |
| 36 | 2329 |
| 37 | 2359 |
| 38 | 2373 |
| 39 | 2465 |
| 40 | 2485 |
| 41 | 2665 |
| 42 | 2667 |
| 43 | 2701 |
| 44 | 2821 |
| 45 | 3045 |
| 46 | 3081 |
| 47 | 3165 |
| 48 | 3171 |
| 49 | 3201 |
| 50 | 3277 |
[21,105,165,205,231,273,301,341,385,465,561,609, 645,651,861,889,903,1045,1065,1105,1265,1281,1365, 1387,1491,1705,1729,1771,1785,1905,2041,2047,2145, 2211,2265,2329,2359,2373,2465,2485,2665,2667,2701, 2821,3045,3081,3165,3171,3201,3277] |